//
//  SJAvatarBrowser.m
//  zhitu
//
//  Created by 陈少杰 on 13-11-1.
//  Copyright (c) 2013年 聆创科技有限公司. All rights reserved.
//

#import "SJAvatarBrowser.h"
static CGRect oldframe;
static CGFloat lastScale;
@implementation SJAvatarBrowser
+(void)showImage:(UIImageView *)avatarImageView{
    UIImage *image=avatarImageView.image;
    UIWindow *window=[UIApplication sharedApplication].keyWindow;
    UIView *backgroundView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
    oldframe=[avatarImageView convertRect:avatarImageView.bounds toView:window];
    backgroundView.backgroundColor=[UIColor blackColor];
    backgroundView.alpha=0;
    UIImageView *imageView=[[UIImageView alloc]initWithFrame:oldframe];
    imageView.image=image;
    imageView.tag=1;
    imageView.userInteractionEnabled=YES;
    imageView.multipleTouchEnabled=YES;
    
    [backgroundView addSubview:imageView];
    [window addSubview:backgroundView];
    
    UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideImage:)];
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(scaleImage:)];
    
    [imageView addGestureRecognizer: pinch];
    [backgroundView addGestureRecognizer: tap];
    
    
    
    [UIView animateWithDuration:0.3 animations:^{
        imageView.frame=CGRectMake(0,([UIScreen mainScreen].bounds.size.height-image.size.height*[UIScreen mainScreen].bounds.size.width/image.size.width)/2, [UIScreen mainScreen].bounds.size.width, image.size.height*[UIScreen mainScreen].bounds.size.width/image.size.width);
        backgroundView.alpha=1;
    } completion:^(BOOL finished) {
        
    }];
}

+(void)scaleImage:(UITapGestureRecognizer*)sender{
    UIView *backgroundView=sender.view;
    [backgroundView bringSubviewToFront:[(UIPinchGestureRecognizer*)sender view]];
    //当手指离开屏幕时,将lastscale设置为1.0
    if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {
        lastScale = 1.0;
        return;
    }
    CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]);
    CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform;
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
    [[(UIPinchGestureRecognizer*)sender view]setTransform:newTransform];
    lastScale = [(UIPinchGestureRecognizer*)sender scale];
}


+(void)hideImage:(UITapGestureRecognizer*)tap{
    UIView *backgroundView=tap.view;
    UIImageView *imageView=(UIImageView*)[tap.view viewWithTag:1];
    [UIView animateWithDuration:0.3 animations:^{
        imageView.frame=oldframe;
        backgroundView.alpha=0;
    } completion:^(BOOL finished) {
        [backgroundView removeFromSuperview];
    }];
}
@end
